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Nation/World

January 10, 2014

Scientists: Americans are becoming weather wimps

WASHINGTON — We’ve become weather wimps.

As the world warms, the United States is getting fewer bitter cold spells like the one that gripped much of the nation this week. So when a deep freeze strikes, scientists say, it seems more unprecedented than it really is. An Associated Press analysis of the daily national winter temperature shows that cold extremes have happened about once every four years since 1900.

Until recently.

When computer models estimated that the national average daily temperature for the Lower 48 states dropped to 17.9 degrees on Monday, it was the first deep freeze of that magnitude in 17 years, according to Greg Carbin, warning meteorologist for the National Oceanic and Atmospheric Administration.

That stretch — from Jan. 13, 1997 to Monday — is by far the longest the U.S. has gone without the national average plunging below 18 degrees, according to a database of daytime winter temperatures starting in January 1900.

In the past 115 years, there have been 58 days when the national average temperature dropped below 18. Carbin said those occurrences often happen in periods that last several days so it makes more sense to talk about cold outbreaks instead of cold days. There have been 27 distinct cold snaps.

Between 1970 and 1989, a dozen such events occurred, but there were only two in the 1990s and then none until Monday.

“This type of event has actually become more infrequent than it was in the past,” said Carbin, who works at the Storm Prediction Center in Norman, Okla. “This is why there was such a big buzz because people have such short memories.”

Said Jeff Masters, meteorology director of the private firm Weather Underground: “It’s become a lot harder to get these extreme (cold) outbreaks in a planet that’s warming.”

And Monday’s breathtaking chill? It was merely the 55th coldest day — averaged for the continental United States — since 1900.

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